Alpha Gruis information

Alpha Gruis
	Location of α Gruis (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Grus
Pronunciation	/ælˈnɛər/
Right ascension	22h 08m 13.98473s
Declination	−46° 57′ 39.5078″
Apparent magnitude (V)	+1.74
Characteristics
Spectral type	B6 V
U−B color index	−0.47
B−V color index	−0.13
Astrometry
Radial velocity (Rv)	+11.8 km/s
Proper motion (μ)	RA: +126.69 mas/yr ; Dec.: −147.47 mas/yr
Parallax (π)	32.29 ± 0.21 mas
Distance	101.0 ± 0.7 ly ; (31.0 ± 0.2 pc)
Absolute magnitude (MV)	−0.72
Details
Mass	4.0 M☉
Radius	3.7 R☉
Luminosity	520 L☉
Surface gravity (log g)	3.76±0.11 cgs
Temperature	13,920 K
Metallicity [Fe/H]	−0.13±0.02 dex
Rotational velocity (v sin i)	215 km/s
Age	100 Myr
Other designations
	Al Na'ir, α Gru, CD−47°14063, FK5 829, GJ 848.2, HD 209952, HIP 109268, HR 8425, SAO 230992
Database references
SIMBAD	data

Alpha Gruis is the brightest star in the southern constellation of Grus. It is officially named Alnair;^[1] Alpha Gruis is the star's Bayer designation, which is Latinized from α Gruis and abbreviated α Gru. With an magnitude of 1.74, it is one of the brightest stars in the sky and one of the fifty-eight stars selected for celestial navigation. Alpha Gruis is a single, B-type main-sequence star located at a distance of 31 pc.

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Observation data Epoch J2000 Equinox J2000
Location of α Gruis (circled)
Constellation	Grus
Pronunciation	/ælˈnɛər/^[1]
Right ascension	22^h 08^m 13.98473^s^[2]
Declination	−46° 57′ 39.5078″^[2]
Apparent magnitude (V)	+1.74^[3]
Characteristics
Spectral type	B6 V^[4]
U−B color index	−0.47^[3]
B−V color index	−0.13^[3]
Astrometry

Radial velocity (R_v)	+11.8^[5] km/s
Proper motion (μ)	RA: +126.69^[2] mas/yr Dec.: −147.47^[2] mas/yr
Parallax (π)	32.29 ± 0.21 mas^[2]
Distance	101.0 ± 0.7 ly (31.0 ± 0.2 pc)
Absolute magnitude (M_V)	−0.72^[6]

Details

Mass	4.0^[7] `M`_☉
Radius	3.7^[8]^[a] `R`_☉
Luminosity	520^[9] `L`_☉
Surface gravity (log g)	3.76±0.11^[10] cgs
Temperature	13,920^[11] K
Metallicity [Fe/H]	−0.13±0.02^[12] dex
Rotational velocity (v sin i)	215^[13] km/s
Age	100^[14] Myr

Other designations
Al Na'ir, α Gru, CD−47°14063, FK5 829, GJ 848.2, HD 209952, HIP 109268, HR 8425, SAO 230992^[15]
Database references
SIMBAD	data

Alpha Gruis information

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